I have spent nearly 16 years studying how the risk of violence grows in societies around the world and running programs designed to stem the tide. I have seen toxic rhetoric from political leaders result in violence in countries like Iraq and Kenya.
On August 12, the same thing happened in Charlottesville, Virginia. The violent clash there came about in part because of a resonance between President Donald Trump’s language and domestic extremist groups who see a doorway open to their goals – goals most Americans have long thought buried for good.
This homegrown horror represents a potentially greater

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